Journal of Morphology

We describe the m. interhyoideus and m. hyohyoideus each as an independent component in P. senegalus. The m. hyohyoideus develops near the external gill muscles and is probably derived from the m. constrictor hyoideus dorsalis.

The axons of olfactory sensory neurons develop and establish glomerular patterning in the olfactory bulb during post-embryonic stages in wild Chinook salmon, a temporal window previously shown to be significant for olfactory imprinting. There are two glomerular territories in this horizontal section of the olfactory bulb from a 798 degree day larva. The yellow dorsal lateral glomerulus (dlG) is double labeled for keyhole limpet hemocyaninin, which labels the axons of teleost olfactory sensory neurons (red) and for the calcium binding protein calretinin (green), which labels microvillous olfactory sensory neurons. The lateral glomerulus 2 is immunoreactive to keyhole limpet hemocyanin, but not to calretinin, indicating that the innervating olfactory sensory neurons may be ciliated, rather than microvillous olfactory sensory neurons.

A non-invasive geometric morphometrics method for exploring variation in dorsal head shape in urodeles that allows detecting shape differences when working at reduced scale (intra and interpopulational level). Because of its non-invasive nature it is suitable for working in living animals.

Stage two atretic vitellogenic follicles of Rhizoprionodon taylori display the aspect of a true epithelial gland, suggesting a temporary secretory activity in this ovarian structure.

Analysis of saurian dental complexity demonstrates that carnivores, such as Varanus rudicollis (left), have simpler teeth than omnivores and herbivores (Platysaurus guttatus and Amblyrhynchus cristatus, middle and right, respectively). Abbreviations: OPCR, orientation patch count rotated.

Male and female spinicaudatan clam shrimp in amplexus (Ozestheria lutraria). Clasper functionality of spinicaudatan clams shrimps (Crustacea, Branchiopoda) has been studied and compared with claspers in other clam shrimps. Despite many clasper parts have appeared convergently in evolution, they operate in a surprisingly similar way during amplexus.

The postovulatory follicle complex is composed of a prominent basement membrane separating the postovulatory theca from the postovulatory follicle. The reticulin stain clearly defines compartmentation in the ovary and supports redefinition of the postovulatory follicle as only the follicle cells that formerly surrounded the oocyte prior to ovulation. The postovulatory follicle is separated from the postovulatory theca.

The life cycle of the tardigrade Hypsibius dujardini. Embryogenesis lasts approximately 4.5 days and hatched juveniles resemble miniature versions of the adults.

All of the yolk of the eggs of lizards is sequestered in endodermal cells attached to an extensive vascular network. Small granulocyte-like cells occupy the interstitial space.